Enhanced Dielectric and Mechanical Performances of the (La+Nb) Co‐doped TiO₂/Silicone Rubber Composites

Silicone rubber (SR) has gained great interest because of its fast deformation response, low modulus, high rebound rate and wide temperature application range. However, their development is hampered by the low dielectric constant. Adding dielectric ceramics may be a solution. In this work, (La+Nb) co‐doped TiO₂/SR composites were fabricated and their properties were systematically tested. By adding co‐doped TiO₂, the performances of the composites were enhanced. High permittivity (3.63) and low loss tangent (7.07×10^‐4) were gained in the SR composites with 30 wt% co‐doped TiO₂. The evenly dispersed co‐doped TiO₂ and the enhanced interfacial polarization effect can be responsible for this. The composites also exhibit enhanced tensile strength (565 kPa) and elongation (259%). In addition, the SR composites were thermally stable up to 415 °C. These superior properties can improve the electrodeformation performance of SR composites, which has great potential in the fields of flexible actuators, bionic flexible robots, next‐generation intelligent medical devices and green energy harvesting.

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